/**
 * Copyright 2011-2013 FoundationDB, LLC
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* The original from which this derives bore the following: */

/*

   Derby - Class org.apache.derby.impl.sql.compile.SavepointNode

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to you under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package com.bj58.sql.parser;

import com.bj58.sql.StandardException;

/**
 * A SavepointNode is the root of a QueryTree that represents a Savepoint (ROLLBACK savepoint, RELASE savepoint and SAVEPOINT)
 * statement.
 */

public class SavepointNode extends DDLStatementNode
{
    public static enum StatementType {
        SET, ROLLBACK, RELEASE
    }
    private StatementType statementType;
    private String savepointName; // Name of the savepoint.

    /**
     * Initializer for a SavepointNode
     *
     * @param objectName The name of the savepoint
     * @param savepointStatementType Type of savepoint statement ie rollback, release or set savepoint
     *
     * @exception StandardException Thrown on error
     */

    public void init(Object objectName,
                     Object statementType)
            throws StandardException {
        initAndCheck(null);
        this.savepointName = (String)objectName;
        this.statementType = (StatementType)statementType;
    }

    /**
     * Fill this node with a deep copy of the given node.
     */
    public void copyFrom(QueryTreeNode node) throws StandardException {
        super.copyFrom(node);

        SavepointNode other = (SavepointNode)node;
        this.statementType = other.statementType;
        this.savepointName = other.savepointName;
    }

    /**
     * Convert this object to a String.  See comments in QueryTreeNode.java
     * for how this should be done for tree printing.
     *
     * @return This object as a String
     */

    public String toString() {
        String tempString = "savepointName: " + "\n" + savepointName + "\n";
        tempString = tempString + "savepointStatementType: " + "\n" + statementType + "\n";
        return super.toString() +    tempString;
    }

    public String statementToString() {
        switch (statementType) {
        case SET:
            return "SAVEPOINT";
        case ROLLBACK:
            return "ROLLBACK WORK TO SAVEPOINT";
        case RELEASE:
            return "RELEASE TO SAVEPOINT";
        default:
            assert false : "Unknown savepoint statement type";
            return "UNKNOWN";
        }
    }

}
